Migrate a project from 3.13 Jira instance to another 4.3.x Jira instance.

i saw a lot of article about how upgrade or restore a Jira instance, but I'm still confused. Is it possible to move one Project from old Jira version to another Jira instance with different versions without "damage" the Jira instance ?

Yes, an export is a full Jira xml backup/export - that contains everything except the attachments.

"Import everything into a temporary 4.3" - yes, you use the xml export of everything. No need to do anything by hand, it'll get all the projects, schemes and so-on. You'll end up with a system the same as when you took the export.

"Export from the temporary 4.3" - yes export the full xml

"import the single project" - yes, but use the "import project" option instead of the "import everything" option. The single project import process needs a full Jira xml export as a source, but is then selective about which bits it imports.

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